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 Exhibit 99.12
 
SRK Consulting (Canada) Inc.              
1500, 155 University Avenue
Toronto, Ontario, Canada
M5H 3B7
 
T: +1.416.601.1445
F: +1.416.601.9046
 
toronto@srk.com
www.srk.com
 
 
CONSENT OF ENGINEER
Ladies and Gentlemen:
 
The undersigned hereby consents to (1) the references to the undersigned’s name included or incorporated by reference in the Annual Report on Form 40-F of Denison Mines Corp. in connection with the reports entitled “Technical Report with an Updated Mineral Resource Estimate for the Waterbury Lake Property, Northern Saskatchewan” dated December 21, 2018, and (2) all other references to the undersigned included or incorporated by reference in the Annual Report on Form 40-F of Denison Mines Corp.
 
Dated:  March 13, 2019
 
(signed) "Cliff Revering" 
__________________________
Cliff Revering, P.Eng.
SRK Consulting (Canada) Inc.
 
 
Local Offices:
Saskatoon
Sudbury
Toronto
Vancouver
Yellowknife
 
Group Offices:
Africa
Asia
Australia
Europe
North America
South America